635 lines
15 KiB
C
635 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Thermal sensor driver for Allwinner SOC
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* Copyright (C) 2019 frank@allwinnertech.com
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#define MAX_SENSOR_NUM 4
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#define FT_TEMP_MASK GENMASK(11, 0)
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#define TEMP_CALIB_MASK GENMASK(11, 0)
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#define CALIBRATE_DEFAULT 0x800
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#define SUN50I_H616_THS_CTRL0 0x00
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#define SUN50I_H616_THS_ENABLE 0x04
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#define SUN50I_H616_THS_PC 0x08
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#define SUN50I_H616_THS_MFC 0x30
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#define SUN50I_H616_THS_TEMP_CALIB 0xa0
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#define SUN50I_H616_THS_TEMP_DATA 0xc0
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#define SUN50I_THS_CTRL0_T_ACQ(x) (GENMASK(15, 0) & (x))
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#define SUN50I_THS_CTRL0_FS_DIV(x) ((GENMASK(15, 0) & (x)) << 16)
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#define SUN50I_THS_FILTER_EN BIT(2)
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#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x))
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#define SUN50I_H616_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
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struct ths_device;
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struct tsensor {
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struct ths_device *tmdev;
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struct thermal_zone_device *tzd;
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int id;
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};
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struct ths_thermal_chip {
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bool has_bus_clk;
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int sensor_num;
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int offset;
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int scale;
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int ft_deviation;
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int temp_data_base;
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int (*calibrate)(struct ths_device *tmdev,
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u16 *caldata, int callen);
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int (*init)(struct ths_device *tmdev);
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int (*get_temp_ext)(void *data, int *temp);
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};
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struct ths_device {
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bool has_calibration;
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const struct ths_thermal_chip *chip;
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struct device *dev;
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struct regmap *regmap;
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struct clk *bus_clk;
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struct clk *mod_clk;
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struct tsensor sensor[MAX_SENSOR_NUM];
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};
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/* Temp Unit: millidegree Celsius */
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static int sunxi_ths_reg2temp(struct ths_device *tmdev, int reg)
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{
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return (reg + tmdev->chip->offset) * tmdev->chip->scale;
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}
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#define SUN8IW21_TEMPH_OFFSET (-2822)
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#define SUN8IW21_TEMPH_SCALE (-68)
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static int sun8iw21_ths_reg2temph(struct ths_device *tmdev, int reg)
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{
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return (reg + SUN8IW21_TEMPH_OFFSET) * SUN8IW21_TEMPH_SCALE;
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}
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#define SUN8IW21_TEMPH_REG (1869)
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static int sun8iw21_ths_get_temp_ext(void *data, int *temp)
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{
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struct tsensor *s = data;
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struct ths_device *tmdev = s->tmdev;
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int val = 0;
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regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
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0x4 * s->id, &val);
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/* ths have no data yet */
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if (unlikely(!val))
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return -EAGAIN;
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if (val > SUN8IW21_TEMPH_REG) {
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*temp = sunxi_ths_reg2temp(tmdev, val);
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} else {
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*temp = sun8iw21_ths_reg2temph(tmdev, val);
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}
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return 0;
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}
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static int sunxi_ths_get_temp(void *data, int *temp)
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{
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struct tsensor *s = data;
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struct ths_device *tmdev = s->tmdev;
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int val = 0;
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if (tmdev->chip->get_temp_ext) {
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return tmdev->chip->get_temp_ext(data, temp);
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} else {
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regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
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0x4 * s->id, &val);
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/* ths have no data yet */
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if (unlikely(!val))
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return -EAGAIN;
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*temp = sunxi_ths_reg2temp(tmdev, val);
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/*
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* There are problems with the calibration values of some platforms,
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* which makes the temperature calculated by the original temperature
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* calculation formula inaccurate. If the chip is calibrated, this
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* value is added by default.*/
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if (tmdev->has_calibration)
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*temp += tmdev->chip->ft_deviation;
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return 0;
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}
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}
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static const struct thermal_zone_of_device_ops ths_ops = {
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.get_temp = sunxi_ths_get_temp,
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};
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static const struct regmap_config config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.fast_io = true,
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};
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/*
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* this calibrate is use cp data
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*/
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static int sun50i_ths_h616_calibrate_cp(struct ths_device *tmdev, void *data,
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int callen)
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{
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int i, ft_temp;
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u32 *caldata = (u32 *)data;
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if (!caldata[0])
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return -EINVAL;
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ft_temp = (caldata[0] >> 24) & GENMASK(5, 0);
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ft_temp += 2;
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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int tt = (caldata[0] >> (i * 6)) & GENMASK(5, 0);
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u32 offset;
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int cdata;
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cdata = CALIBRATE_DEFAULT - ((tt - ft_temp) * 12401) / 1000;
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offset = (i % 2) * 16;
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regmap_update_bits(tmdev->regmap,
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SUN50I_H616_THS_TEMP_CALIB + (i / 2 * 4),
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0xfff << offset, cdata << offset);
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}
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return 0;
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}
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/*
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* this calibrate is use ft data
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*/
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static int sun50i_h616_ths_calibrate(struct ths_device *tmdev,
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u16 *caldata, int callen)
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{
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struct device *dev = tmdev->dev;
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int i, ft_temp;
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if (!caldata[0])
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return -EINVAL;
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/*
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* efuse layout:
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*
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* 0 11 16 27 32 43 48 57
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* +----------+-----------+-----------+-----------+
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* | temp | |sensor0| |sensor1| |sensor2| |
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* +----------+-----------+-----------+-----------+
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* ^ ^ ^
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* | | |
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* | | sensor3[11:8]
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* | sensor3[7:4]
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* sensor3[3:0]
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*
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* The calibration data on the H616 is the ambient temperature and
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* sensor values that are filled during the factory test stage.
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*
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* The unit of stored FT temperature is 0.1 degreee celusis.
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*
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* We need to calculate a delta between measured and caluclated
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* register values and this will become a calibration offset.
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*/
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ft_temp = caldata[0] & FT_TEMP_MASK;
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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int delta, cdata, offset, reg;
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if (i == 3)
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reg = (caldata[1] >> 12)
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| (caldata[2] >> 12 << 4)
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| (caldata[3] >> 12 << 8);
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else
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reg = (int)caldata[i + 1] & TEMP_CALIB_MASK;
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/*
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* Our calculation formula is like this,
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* the temp unit above is Celsius:
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*
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* T = (sensor_data + a) / b
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* cdata = 0x800 - [(ft_temp - T) * b]
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*
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* b is a floating-point number
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* with an absolute value less than 1000.
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*
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* sunxi_ths_reg2temp uses milli-degrees Celsius,
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* with offset and scale parameters.
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* T = (sensor_data + a) * 1000 / b
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*
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* ----------------------------------------------
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*
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* So:
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*
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* offset = a, scale = 1000 / b
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* cdata = 0x800 - [(ft_temp - T) * 1000 / scale]
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*/
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delta = (ft_temp * 100 - sunxi_ths_reg2temp(tmdev, reg))
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/ tmdev->chip->scale;
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cdata = CALIBRATE_DEFAULT - delta;
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if (cdata & ~TEMP_CALIB_MASK) {
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dev_warn(dev, "sensor%d is not calibrated.\n", i);
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continue;
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}
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offset = (i % 2) * 16;
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regmap_update_bits(tmdev->regmap,
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SUN50I_H616_THS_TEMP_CALIB + (i / 2 * 4),
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0xfff << offset,
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cdata << offset);
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}
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tmdev->has_calibration = true;
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return 0;
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}
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static int sun50i_h616_ths_calibrate_wrap(struct ths_device *tmdev,
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u16 *caldata, int callen)
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{
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struct nvmem_device *ndev;
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struct device *dev = tmdev->dev;
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u32 t;
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u16 d;
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ndev = devm_nvmem_device_get(dev, "sid");
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if (IS_ERR(ndev)) {
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if (PTR_ERR(ndev) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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else
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return sun50i_h616_ths_calibrate(tmdev, caldata,
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callen);
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}
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nvmem_device_read(ndev, 0, 2, &d);
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switch (d) {
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case 0x7400:
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case 0x7c00:
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case 0x2400:
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case 0x2c00:
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break;
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case 0x5000:
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case 0x5400:
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case 0x5c00:
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default:
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/* ft style */
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devm_nvmem_device_put(dev, ndev);
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return sun50i_h616_ths_calibrate(tmdev, caldata, callen);
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}
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/* cp style */
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nvmem_device_read(ndev, 0x1c, 4, &t);
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sun50i_ths_h616_calibrate_cp(tmdev, &t, 4);
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devm_nvmem_device_put(dev, ndev);
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return 0;
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}
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#define SUN8IW21_CAL_COM (7000)
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static int sun8iw21_ths_calibrate(struct ths_device *tmdev,
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u16 *caldata, int callen)
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{
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struct device *dev = tmdev->dev;
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int i, ft_temp;
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if (!caldata[0])
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return -EINVAL;
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/*
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* efuse layout:
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*
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* 0 11 23 31 35 47 63
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* +-------+-------+-----+----+-------+-----------+
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* | temp |sensor2| | |sensor0|
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* +----------+----------+-----------+------------+
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* ^ ^
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* | |
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* | |
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* | sensor1[11:8]
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* sensor1[7:0]
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*
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* The calibration data on the H616 is the ambient temperature and
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* sensor values that are filled during the factory test stage.
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*
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* The unit of stored FT temperature is 0.1 degreee celusis.
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*
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* We need to calculate a delta between measured and caluclated
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* register values and this will become a calibration offset.
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*/
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ft_temp = caldata[0] & FT_TEMP_MASK;
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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int delta, cdata, offset, reg;
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switch (i) {
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case 0:
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reg = (caldata[2] >> 4) & TEMP_CALIB_MASK;
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break;
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case 1:
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reg = ((caldata[1] >> 8) | (caldata[2] << 8)) & TEMP_CALIB_MASK;
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break;
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case 2:
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reg = ((caldata[0] >> 12) | (caldata[1] << 4)) & TEMP_CALIB_MASK;
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break;
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default:
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return -EINVAL;
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}
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/*
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* Our calculation formula is like this,
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* the temp unit above is Celsius:
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*
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* T = (sensor_data + a) / b
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* cdata = 0x800 - [(ft_temp - T) * b]
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*
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* b is a floating-point number
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* with an absolute value less than 1000.
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*
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* sunxi_ths_reg2temp uses milli-degrees Celsius,
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* with offset and scale parameters.
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* T = (sensor_data + a) * 1000 / b
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*
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* ----------------------------------------------
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*
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* So:
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*
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* offset = a, scale = 1000 / b
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* cdata = 0x800 - [(ft_temp - T) * 1000 / scale]
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*/
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delta = (ft_temp * 100 + SUN8IW21_CAL_COM - sunxi_ths_reg2temp(tmdev, reg))
|
||
|
|
/ tmdev->chip->scale;
|
||
|
|
cdata = CALIBRATE_DEFAULT - delta;
|
||
|
|
if (cdata & ~TEMP_CALIB_MASK) {
|
||
|
|
dev_warn(dev, "sensor%d is not calibrated.\n", i);
|
||
|
|
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
offset = (i % 2) * 16;
|
||
|
|
regmap_update_bits(tmdev->regmap,
|
||
|
|
SUN50I_H616_THS_TEMP_CALIB + (i / 2 * 4),
|
||
|
|
0xfff << offset,
|
||
|
|
cdata << offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
tmdev->has_calibration = true;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sunxi_ths_calibrate(struct ths_device *tmdev)
|
||
|
|
{
|
||
|
|
struct nvmem_cell *calcell;
|
||
|
|
struct device *dev = tmdev->dev;
|
||
|
|
u16 *caldata;
|
||
|
|
size_t callen;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
calcell = devm_nvmem_cell_get(dev, "calibration");
|
||
|
|
if (IS_ERR(calcell)) {
|
||
|
|
if (PTR_ERR(calcell) == -EPROBE_DEFER)
|
||
|
|
return -EPROBE_DEFER;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
caldata = nvmem_cell_read(calcell, &callen);
|
||
|
|
if (IS_ERR(caldata)) {
|
||
|
|
ret = PTR_ERR(caldata);
|
||
|
|
goto put;
|
||
|
|
}
|
||
|
|
|
||
|
|
tmdev->chip->calibrate(tmdev, caldata, callen);
|
||
|
|
|
||
|
|
|
||
|
|
kfree(caldata);
|
||
|
|
put:
|
||
|
|
devm_nvmem_cell_put(dev, calcell);
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sunxi_ths_resource_init(struct ths_device *tmdev)
|
||
|
|
{
|
||
|
|
struct device *dev = tmdev->dev;
|
||
|
|
struct platform_device *pdev = to_platform_device(dev);
|
||
|
|
struct resource *mem;
|
||
|
|
void __iomem *base;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
|
base = devm_ioremap_resource(dev, mem);
|
||
|
|
if (IS_ERR(base))
|
||
|
|
return PTR_ERR(base);
|
||
|
|
|
||
|
|
tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
|
||
|
|
if (IS_ERR(tmdev->regmap))
|
||
|
|
return PTR_ERR(tmdev->regmap);
|
||
|
|
|
||
|
|
if (tmdev->chip->has_bus_clk) {
|
||
|
|
tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
|
||
|
|
if (IS_ERR(tmdev->bus_clk))
|
||
|
|
return PTR_ERR(tmdev->bus_clk);
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = clk_prepare_enable(tmdev->bus_clk);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = sunxi_ths_calibrate(tmdev);
|
||
|
|
if (ret)
|
||
|
|
goto bus_disable;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
bus_disable:
|
||
|
|
clk_disable_unprepare(tmdev->bus_clk);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sun50i_h616_thermal_init(struct ths_device *tmdev)
|
||
|
|
{
|
||
|
|
int val;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For sun50iw9p1:
|
||
|
|
* It is necessary that reg[0x03000000] bit[16] is 0.
|
||
|
|
*/
|
||
|
|
regmap_write(tmdev->regmap, SUN50I_H616_THS_CTRL0,
|
||
|
|
SUN50I_THS_CTRL0_T_ACQ(47) | SUN50I_THS_CTRL0_FS_DIV(479));
|
||
|
|
regmap_write(tmdev->regmap, SUN50I_H616_THS_MFC,
|
||
|
|
SUN50I_THS_FILTER_EN |
|
||
|
|
SUN50I_THS_FILTER_TYPE(1));
|
||
|
|
regmap_write(tmdev->regmap, SUN50I_H616_THS_PC,
|
||
|
|
SUN50I_H616_THS_PC_TEMP_PERIOD(365));
|
||
|
|
val = GENMASK(tmdev->chip->sensor_num - 1, 0);
|
||
|
|
regmap_write(tmdev->regmap, SUN50I_H616_THS_ENABLE, val);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sunxi_ths_register(struct ths_device *tmdev)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < tmdev->chip->sensor_num; i++) {
|
||
|
|
tmdev->sensor[i].tmdev = tmdev;
|
||
|
|
tmdev->sensor[i].id = i;
|
||
|
|
tmdev->sensor[i].tzd =
|
||
|
|
devm_thermal_zone_of_sensor_register(tmdev->dev,
|
||
|
|
i,
|
||
|
|
&tmdev->sensor[i],
|
||
|
|
&ths_ops);
|
||
|
|
if (IS_ERR(tmdev->sensor[i].tzd))
|
||
|
|
return PTR_ERR(tmdev->sensor[i].tzd);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sunxi_ths_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct ths_device *tmdev;
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL);
|
||
|
|
if (!tmdev)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
tmdev->dev = dev;
|
||
|
|
tmdev->chip = of_device_get_match_data(&pdev->dev);
|
||
|
|
if (!tmdev->chip)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, tmdev);
|
||
|
|
|
||
|
|
ret = sunxi_ths_resource_init(tmdev);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = tmdev->chip->init(tmdev);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = sunxi_ths_register(tmdev);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sunxi_ths_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct ths_device *tmdev = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
clk_disable_unprepare(tmdev->bus_clk);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __maybe_unused sunxi_thermal_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct ths_device *tmdev = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
clk_disable_unprepare(tmdev->bus_clk);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __maybe_unused sunxi_thermal_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
struct ths_device *tmdev = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
clk_prepare_enable(tmdev->bus_clk);
|
||
|
|
sunxi_ths_calibrate(tmdev);
|
||
|
|
tmdev->chip->init(tmdev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct ths_thermal_chip sun50iw9p1_ths = {
|
||
|
|
.sensor_num = 4,
|
||
|
|
.has_bus_clk = true,
|
||
|
|
.offset = -3255,
|
||
|
|
.scale = -81,
|
||
|
|
.ft_deviation = 8000,
|
||
|
|
.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
|
||
|
|
.calibrate = sun50i_h616_ths_calibrate_wrap,
|
||
|
|
.init = sun50i_h616_thermal_init,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct ths_thermal_chip sun50iw10p1_ths = {
|
||
|
|
.sensor_num = 3,
|
||
|
|
.has_bus_clk = true,
|
||
|
|
.offset = -2794,
|
||
|
|
.scale = -67,
|
||
|
|
.ft_deviation = 8000,
|
||
|
|
.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
|
||
|
|
.calibrate = sun50i_h616_ths_calibrate,
|
||
|
|
.init = sun50i_h616_thermal_init,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct ths_thermal_chip sun50iw11p1_ths = {
|
||
|
|
.sensor_num = 1,
|
||
|
|
.has_bus_clk = true,
|
||
|
|
.offset = -2794,
|
||
|
|
.scale = -67,
|
||
|
|
.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
|
||
|
|
.calibrate = sun50i_h616_ths_calibrate,
|
||
|
|
.init = sun50i_h616_thermal_init,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct ths_thermal_chip sun8iw21p1_ths = {
|
||
|
|
.sensor_num = 3,
|
||
|
|
.has_bus_clk = true,
|
||
|
|
.offset = -2796,
|
||
|
|
.scale = -70,
|
||
|
|
.ft_deviation = 0,
|
||
|
|
.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
|
||
|
|
.calibrate = sun8iw21_ths_calibrate,
|
||
|
|
.init = sun50i_h616_thermal_init,
|
||
|
|
.get_temp_ext = sun8iw21_ths_get_temp_ext,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct of_device_id of_ths_match[] = {
|
||
|
|
{ .compatible = "allwinner,sun50iw9p1-ths", .data = &sun50iw9p1_ths },
|
||
|
|
{ .compatible = "allwinner,sun50iw10p1-ths", .data = &sun50iw10p1_ths },
|
||
|
|
{ .compatible = "allwinner,sun50iw11p1-ths", .data = &sun50iw11p1_ths },
|
||
|
|
{ .compatible = "allwinner,sun8iw21p1-ths", .data = &sun8iw21p1_ths },
|
||
|
|
{ /* sentinel */ },
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, of_ths_match);
|
||
|
|
|
||
|
|
static SIMPLE_DEV_PM_OPS(sunxi_thermal_pm_ops,
|
||
|
|
sunxi_thermal_suspend, sunxi_thermal_resume);
|
||
|
|
|
||
|
|
static struct platform_driver ths_driver = {
|
||
|
|
.probe = sunxi_ths_probe,
|
||
|
|
.remove = sunxi_ths_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "sunxi-thermal",
|
||
|
|
.pm = &sunxi_thermal_pm_ops,
|
||
|
|
.of_match_table = of_ths_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(ths_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC");
|
||
|
|
MODULE_LICENSE("GPL v2");
|